Hi Estrella, Thanks for contacting us! One thing you can do with Ribbet (which may help), is to open up a previous collage from the Library > History tab, and then click the Undo button (up the top right) until you’re back in Collage mode. This will allow you to keep the settings (aspect ratio etc) of your previous collage, and just replace the images. Hopefully that’s of some help to you. Let us know if you have any further questions!